At 18, Thomas Nickell, even in a world populated by numerous prodigies who began to play in public at very young ages, still deserves to be considered a young, emerging artist, and this concert showed him to be a notably mature and tasteful one.  He is currently a student at the New School, Mannes College of Music, studying piano and composition, both with equal seriousness. He has already played programs in concert and with orchestra in the United Kingdom, Italy, Japan, and Chicago, and has been honored as a Steinway artist and is represented by Alexander & Buono International. The concert, a repeat of his London debut, gave the full house something else to be grateful for: a visit from an outstanding British chamber orchestra—in this instance all strings—The Orchestra of the Swan, based in Stratford-upon-Avon, under the direction of its founder and music director, David Curtis, who is as enterprising and personable as he is musical.